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Crystallization of Silicon Films on Glass: A Comparison of Methods

Published online by Cambridge University Press:  15 February 2011

Ross A. Lemons ,
Martin A. Bosch  and
Dieter Herbst
Ross A. Lemons
Affiliation:
*Los Alamos National Laboratory, MS D429, Los Alamos, NM 87545
Martin A. Bosch
Affiliation:
*Los Alamos National Laboratory, MS D429, Los Alamos, NM 87545
Dieter Herbst
Affiliation:
**Bell Laboratories, Holmdel, NJ 07733
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Abstract

The lure of flat panel displays has stimulated much research on the crystallization of silicon films deposited on large-area transparent substrates. In most respects, fused quartz is ideal. It has high purity, thermal shock resistance, and a softening point above the silicon melting temperature. Unfortunately, fused quartz has such a small thermal expansion that the silicon film cracks as it cools. This problem has been attacked by patterning with islands or moats before and after crystallization, by capping, and by using silicate glass substrates that match the thermal expansion of silicon. The relative merits of these methods are compared. Melting of the silicon film to achieve high mobility has been accomplished by a variety of methods including lasers, electron beams, and strip heaters. For low melting temperature glasses, surface heating with a laser or electron beam is essential. Larger grains are obtained with the high bias temperature, strip heater techniques The low-angle grain boundaries characteristic of these films may be caused by constitutional undercooling. A model is developed to predict the boundary spacing as a function of scan rate and temperature gradient.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 13 , 1982 , 581
Copyright
Copyright © Materials Research Society 1983

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Footnotes

*

Research performed by the authors was done at Bell Laboratories, Holmdel, NJ.

References

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